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Question
Give reason for the following:
Purified and dried hydrogen is collected over mercury.
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Solution
Purified and dried hydrogen is collected over mercury because mercury has no reaction with it.
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Multiple Choice Question
The metal which reacts with cold water to produce hydrogen is
What is noticed if the products are not allowed to escape?
Why are the following metals not used in the lab preparation of hydrogen?
calcium
Complete and balance the following reaction.
Na + H2O →_____________ +___________
Give reason:
A candle brought near the mouth of a jar containing hydrogen gas starts burning but is extinguished when pushed inside the jar.
Select the correct options for the following statement:
The acid _____ is not Used in the laboratory preparation of hydrogen, using zinc and an acid.
Select the correct options for the following statement:
The product formed on combustion of hydrogen in air is ___.
Complete and balance the equation:
[General method]
Reactions of active metals - cold water
Calcium - Ca + H2O → ______+ _______ [g]
Give a balanced equation for obtaining hydrogen from?
Steam using a metal – and the reaction is reversible.
Give a balanced equation for the following conversion.
\[\ce{KAlO2<-KOH->K2ZnO2}\]
